Improvement of human operator vibroprotection system in the utility machine

Korchagin, P. A.; Teterina, I. A.; Rahuba, L. F.

doi:10.1088/1742-6596/944/1/012059

Cited by 16 publications

(4 citation statements)

References 2 publications

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“…Это характерно для традиционных инерционных вибровозбудителей дебалансного типа [1], используемых в технических системах и требующих при эксплуатации обеспечения вибрационной защиты как оператора, так и других узлов и устройств системы. Это особенно актуально для систем, генерирующих вибрационное воздействие значительной величины [2,3].…”

Section: Doi: 1025206/2310-9793-7-1-123-128unclassified

“…Тем самым полная сила, действующая на общее для дебалансов и кривошипа основание устройства в симметричном случае в направлении оси y , может быть определена как 2 2 Троллей, или Zip-Line [3] -это скоростной спуск по натянутому под углом канату или веревке. Первоначально троллеи использовались для транспортировки грузов и людей через реки, каньоны и различные непроходимые горные участки.…”

Section: рис 1 кинематическая схема генератора периодической силы иunclassified

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Generator of Periodic Inertia Force Concentrated in One Direction

Mikheyev¹

2019

DSMM

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Аннотация. В работе рассматривается техническая задача построения генератора периодического динамического воздействия высокой степени направленности, основанного на использовании сил инерции. Конструкция предлагаемого в работе устройства, преобразующего вращения кривошипа специального вида в качание пары массивных дебалансов, допускает реализацию силового воздействия, направленного вдоль выбранного направления выделенной оси. Зависимость полученного воздействия от времени носит гармонический характер, выгодно отличая его от существующих конструкций подобных устройств.

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Section: Doi: 1025206/2310-9793-7-1-123-128unclassified

Section: рис 1 кинематическая схема генератора периодической силы иunclassified

Generator of Periodic Inertia Force Concentrated in One Direction

Mikheyev¹

2019

DSMM

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“…The use of vibration isolation systems is a prerequisite for protecting the equipment [2], especially high-precision machines [3] and different vehicles operators [4]. Road [5], construction [6] and mining machines [7], earth-moving and utility vehicles [8] are particularly exposed to the effects of vibrations. Vibrations cause occupational diseases among the machine operators [9].…”

Section: Introductionmentioning

confidence: 99%

Study of the external section shape of the static characteristic of the antivibration suspension with a quasi-zero stiffness section

Корытов

Shcherbakov

Titenko

et al. 2022

J. Phys.: Conf. Ser.

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The paper considers the vibration isolation problem of the construction and road vehicles operator’s seat with prescribed sinusoidal displacements of the seat base. This problem is highly relevant, since the road construction vehicles operation with soil, loads, road surfaces, etc. is accompanied by the strong vibrations. The investigation was carried out in terms of the influence of the suspension static power characteristic shape on the maximum vibration acceleration of the seat. Many antivibration mechanisms have a similar static characteristic. Currently, one of the promising directions in the development of the antivibration systems is the implementation of the systems with a quasi-zero stiffness section of the static power characteristic. Such systems are preferred to dampen the low-frequency vibrations. In this paper, we study the systems having a three-segment static characteristic, which middle segment is a horizontal straight line corresponding to a section of quasi-zero stiffness. However, two extreme segments providing the braking and stopping of the mechanism when going beyond the boundaries of the quasi-zero stiffness section were described by Hermite splines with a maximum second-order derivative. The analytical expression of such a two-point spline makes it possible to set not only the function values at two boundary points, but also the values of the first two derivatives of this function at the same points, i.e. to vary the shape of such spline within a wide range. This has made it possible to consider several dozen combinations of such splines having different values of the first derivative at both boundary points, i.e. to study the differently shaped static power characteristics of the antivibration mechanism of the seat under the same sinusoidal influences. The sum of accelerations calculated for a sample of the specified seat base vibrations from the amplitude and time values combinations was used as the assessment and evaluation criterion of various static power characteristics. Furthermore, the amplitude and time values combinations, at which the maximum value of the antivibration mechanism displacements exceeded the limits of at least one of the static characteristics, were excluded from consideration and were not taken into account when calculating the criterion values. The criterion minimum value was found out to be reached at zero value of the first force derivative at the internal boundary points of the external characteristic segments, at the maximum value of the first force derivative at the external boundary points of the external characteristic segments. In this case, the first force derivative has no discontinuities on the entire static force characteristic curve. The given static characteristic is optimal according to the accepted criterion. The value of the acceleration sum criterion can be decreased fourfold in the studied range of the first derivatives from zero to twenty thousand Newton/meter.

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“…The most urgent problem of these machines is the protection of the operator from the effects of vibrations that occur during the machine operation [2]. The analysis of academic publications shows that operators of all major types of soil-moving machines, such as bulldozers [3], graders [4], excavators [5], road cleaning machines [6], front loaders [7], scrapers [8], are exposed to significant vibrations. Hand tools for breaking soil, rocks, or asphalt-concrete pavement also transmit significant vibrations to the operator [9].…”

Section: Introductionmentioning

confidence: 99%

Use of the Belleville spring package in the vibration protection mechanism of the operator’s seat

Корытов

Shcherbakov

Titenko³

et al. 2022

J. Phys.: Conf. Ser.

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Reducing the vibration effects on the operator of a construction, road and other machines is a relevant objective, since its accomplishing improves the efficiency and accuracy of the work performed by machines and reduces the risk of operators’ occupational diseases. Vibration protection systems with the effect of quasi-zero stiffness are promising. To produce this effect, Belleville springs packages can be used. They are a way to create a simple, reliable and inexpensive passive mechanism of the vibration protection system of the operator’s seat. The influence of the static characteristic center slope of two Belleville springs packages on the maximum acceleration of the load under the sinusoidal kinematic excitation of the seat base movements is investigated. The static characteristic center slope of the spring packages was characterized by the coefficient that affects the type of the static characteristic according to the known analytical expressions for the separate spring force. To obtain the chair acceleration values in a fixed coordinate system, we used a simulation mathematical model developed in the Simscape Multibody package for modeling mechanical systems of the MATLAB mathematical system. The model used blocks of a fixed coordinate system, a sliding joint and a rigid body forming a chain. The maximum acceleration of the chair in a fixed coordinate system was defined during a predetermined period of time at the end of the transition process under the steady state oscillations. When conducting the computational experiment, the specified oscillations amplitude of the chair base and the angular frequency of these oscillations varied. For a proper comparison of the experimental results in the form of graphical dependencies of the maximum acceleration on the amplitude and frequency, the ranges of acceptable and unacceptable arguments combinations were selected for the two spring packages. The combinations of amplitude and frequency were considered unacceptable when the maximum deformation of the spring package went beyond the static characteristic maximum. For the two packages of springs, the acceptable regions were different, therefore their intersection used for the comparative analysis, was obtained. The springs package with a relatively high stiffness in the center of the static characteristic is found out to generally provide better vibration protection of the chair in the entire acceptable range of arguments. Simultaneously, a package with lower stiffness in the center of the characteristic dampens vibrations better in the small amplitudes area, i.e. when operating in the quasi-zero stiffness area.

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Improvement of human operator vibroprotection system in the utility machine

Cited by 16 publications

References 2 publications

Generator of Periodic Inertia Force Concentrated in One Direction

Generator of Periodic Inertia Force Concentrated in One Direction

Study of the external section shape of the static characteristic of the antivibration suspension with a quasi-zero stiffness section

Use of the Belleville spring package in the vibration protection mechanism of the operator’s seat

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